Solid electrolyte battery

Abstract

A solid electrolyte battery includes a cathode having a cathode active material and a solid electrolyte and an anode. The solid electrolyte includes a first polymer having a binding force and a second polymer composed of alkali metal ion conducting polymers. Thus, the solid electrolyte battery has a high capacity and is excellent in its battery characteristics.

1. A solid electrolyte battery comprising:
 a cathode including a cathode composite mixture, said mixture comprising a cathode active material and a solid electrolyte wherein said solid electrolyte comprises a first polymer and a second polymer; 
 an anode; and 
 a separator disposed between said cathode and said anode; 
 wherein said first polymer has a binding force; and 
 wherein said first polymer is selected from the group consisting of polyvinylidene fluoride, polytetrafluoro ethylene, styrene-butadiene rubber, and mixtures thereof; and 
 wherein said second polymer is capable of conducting alkali-metal ions and comprises an electrolyte salt and a complex; and 
 comprising one or more repeating structural units of formula II, 
 
       
         
           
           
               
               
           
         
         wherein n is an integer from 1 to 12; and 
         wherein R 1  is selected from the group consisting of alkyl groups having 1 to 12 carbons, alkenyl groups having 2 to 8 carbons, cycloalkyl groups having 3 to 8 carbons, aryl groups having 6 to 14 carbons, aralkyl groups having 7 to 12 carbons, and tetrahydropyranyl groups. 
       
     
     
       2. The solid electrolyte battery according to  claim 1 , wherein the cathode further comprises a conducting assistant. 
     
     
       3. The solid electrolyte battery according to  claim 2 , wherein said conducting assistant is graphite. 
     
     
       4. The solid electrolyte battery according to  claim 1 , wherein the second polymer has a glass transition point of −60°C. or lower in accordance with a differential scanning calorimetry. 
     
     
       5. The solid electrolyte battery according to  claim 1 , wherein the cathode active material is a material capable of doping and dedoping from alkali metal ions. 
     
     
       6. The solid electrolyte battery according to  claim 5 , wherein said cathode active material is selected from the group consisting of metallic-oxide powders, metallic-sulfide powders, and mixtures thereof. 
     
     
       7. The solid electrolyte battery according to  claim 6 , wherein said cathode active material is selected from the group consisting of TiS 2 , MoS 2 , NbSe 2 , FeS, FeS 2 , V 2 O 5 , and mixtures thereof. 
     
     
       8. The solid electrolyte battery according to  claim 6 , wherein said cathode active material comprises Li x MO 2  wherein M is an element selected from the group consisting of Co, Ni, and Mn, and wherein x is in a range from 0.05 to 1.10. 
     
     
       9. The solid electrolyte battery according to  claim 6 , wherein said cathode active material comprises LiNi p  M1 q  M2 r  MO 2  wherein M1 and M2 are each elements separately selected from the group consisting of Al, Mn, Fe, Co, Ni, Cr, Ti, Zn, P and B, and wherein p+q+r=1. 
     
     
       10. The solid electrolyte battery according to  claim 1 , wherein the anode comprises a material selected from the group consisting of alkali metals, alloys capable of doping and dedoping from alkali metals, carbon materials capable of doping and dedoping from alkali metals, and mixtures thereof. 
     
     
       11. The solid electrolyte battery according to  claim 10 , wherein said anode material is selected from the group consisting of lithium, sodium, pyrocarbon, coke, carbon black, vitreous carbon, organic polymer sintered bodies, carbon fiber, alloys thereof, and mixtures thereof. 
     
     
       12. The solid electrolyte battery according to  claim 1 , wherein said cathode further comprises a cathode current collector wherein said mixture is formed on said current collector. 
     
     
       13. The solid electrolyte battery according to  claim 12 , wherein said current collector comprises a metallic foil selected from the group consisting of aluminum foil, nickel foil, stainless steel foil, and mixtures thereof. 
     
     
       14. The solid electrolyte battery according to  claim 1 , wherein said solid electrolyte of said cathode is a first solid electrolyte and said anode further comprises a second solid electrolyte. 
     
     
       15. The solid electrolyte battery according to  claim 14 , wherein said second solid electrolyte of said anode is substantially the same as said first solid electrolyte of the cathode. 
     
     
       16. The solid electrolyte battery according to  claim 1 , wherein the complex of the second polymer further comprises one or more repeating structural units of formula III, 
       
         
           
           
               
               
           
         
         wherein R 2  is selected from the group consisting of hydrogen atoms, alkyl groups, alkenyl groups, cycloalkyl groups, aryl groups, and allyl groups. 
       
     
     
       17. The solid electrolyte battery according to  claim 16 , wherein said solid electrolyte of said cathode is a first solid electrolyte and said anode further comprises a second solid electrolyte. 
     
     
       18. The solid electrolyte battery according to  claim 17 , wherein said second solid electrolyte of said anode is substantially the same as said first solid electrolyte of the cathode. 
     
     
       19. The solid electrolyte battery according to  claim 1 , wherein said separator comprises a solid polymer electrolyte film. 
     
     
       20. The solid electrolyte battery according to  claim 1 , wherein the first polymer and the second polymer are present at a 1:1 ratio. 
     
     
       21. The solid electrolyte battery according to  claim 1 , wherein the first polymer is no more than 3% wt. of the cathode composite mixture. 
     
     
       22. The solid electrolyte battery according to  claim 1 , wherein the second polymer is no more than 3% wt. of the cathode composite mixture.